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Aqueous powder dispersions / Dhanashri , Bagal in PAINTINDIA, Vol. LII, N° 12 (12/2002)

[article]  inPAINTINDIA > Vol. LII, N° 12 (12/2002) . - p. 29-32 Titre : Aqueous powder dispersions Type de document : texte imprimé Auteurs : Dhanashri , Bagal, Auteur ; V. C. Malshe, Auteur Année de publication : 2002 Article en page(s) : p. 29-32 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Powder coatings, waterborne coatings andhigh solids coatings are most preferred today, as they are ecofriendly. More so the powder coating industry attracts more attention, as the composition of the coating is solvent free. they are also efficient, durable, and resistant toacid rain, UV rays and are chip and scratch resistant. That is the reason they are widely used in various fields. Note de contenu : - Appearance - Storage - Other problems - Why powder slurries ? - Process for preparing an aqueous dispersion coating composition : Application - Mechanism of drying - Curing - Use in packaging containers - Use in automotive industry : Future Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12387 [article]

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The effect of isocyanate index -NCO/-OH on the structure of polyurethane dispersion / Zhou Ming in PAINTINDIA, Vol. LII, N° 12 (12/2002)

[article]  inPAINTINDIA > Vol. LII, N° 12 (12/2002) . - p. 33-40 Titre : The effect of isocyanate index -NCO/-OH on the structure of polyurethane dispersion Type de document : texte imprimé Auteurs : Zhou Ming, Auteur ; Jiang Denggao, Auteur ; Hou Cuihong, Auteur Année de publication : 2002 Article en page(s) : p. 33-40 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane water-borne dispersions with different isocyanate index where prepared by using branched chain compound polyether under the same process conditions. With the increment of isocyanate index, pattern of dispersion granules turned from disorder linear spiral wound to inner molecular spherical concentration. At high Ri values, viscosity of dispersions increased with the increment of temperature during some temperature range. At room temperature, affected by the low Tgs ( glass transition temperature ) in soft segment, the polymers molecules were in an non-crystal state. With the increment of isocyanate index, polyesters inner molecular stress increased, when it was heated,the film cracked due to stress transition. Tgs between soft and hard segments are similar, so micro-phase separation was further enchanced. Note de contenu : - Experimental : Main raw material - Preparation of PU dispersion - Characterization - Results and discussion : Effect of Ri value on PU dispersions surface structure - Surface structure of filmed polymers - Phase inversion of polymer dispersions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12388 [article]

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A novel approach to correlate permeability and porosity in latex coatings / Biman Ghosh in PAINTINDIA, Vol. LII, N° 12 (12/2002)

[article]  inPAINTINDIA > Vol. LII, N° 12 (12/2002) . - p. 41-49 Titre : A novel approach to correlate permeability and porosity in latex coatings Type de document : texte imprimé Auteurs : Biman Ghosh, Auteur ; Tanmay Chattopadhyay, Auteur Année de publication : 2002 Article en page(s) : p. 41-49 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Two significant factors affecting the performance of architectural water based paints are durability and appearance. Permeability and porosity are the responsible factors in the determination of durability and appearance of the coating. The role of PVC is singularly most important aspect in the determination of permeability and porosity. Problems with latex coatings are due to their high permeability which leads to defects such as efflorescence, which is the leaching out of the soluble salts from the substrate through the paint film, that affect gloss and produce patches on the paint film. A series of experiments were conducted to establish conclusively the effect of Pigment Volume Concentration (PVC) on porosity and on permeability to determine the product performance. Authors of the present paper have investigated the effect of film thickness on porosity and have established the correlation between porosity and permeability at various PVCs. The authors have also established that porosity do not vary with film thickness and porosity linearly increases with PVC showing a point of inflexion at the Critical Pigment Volume Concentration (CP VC). Actually, porosity at the paint surface does not change with film thickness, but increases with PVC as more porous pigment volume replaces less porous binder volume. However, permeability was found to increase with PVC till CPVC, after which it decreased. This is because the incorporation of hydrophilic pigment increases the fraction of film allowing water vapour transport, but above CPVC permeability decreases due to the barrier effect from the pigment. The plot of permeability with porosity was similar to the plot of permeability with PVC. Note de contenu : - Principal model of permeation - Water vapour permeability in pigmented film - Experimental - Determination of porosity of films - Determination of permeability of paint film - Porosity of paint at different wet film thickness (WFT) - Permeability of paint having different PVC Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12389 [article]

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Micro-foam : The unseen adversary / Terence Kenneth in PAINTINDIA, Vol. LII, N° 12 (12/2002)

[article]  inPAINTINDIA > Vol. LII, N° 12 (12/2002) . - p. 51-54 Titre : Micro-foam : The unseen adversary Type de document : texte imprimé Auteurs : Terence Kenneth, Auteur Année de publication : 2002 Article en page(s) : p. 51-54 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Metallic inks offer dazzling visual effects to any company that is looking to enhance the appearance of their products, from labels to bags, and from folding cartons to flexible packaging. At Eckart America we are tacking steps to educate printers, ink companies, and end-users about possibilities with metallic inks so that their true value can be realized. Bronze-based metallic inks are now available for a wide variety of substrates and applications, ranging from tactile screenprinted inks for paper to highly reflective foil-like inks for film laminations. By knowing how to effectively manage these types of inks on press, everyone benefits and we all win. Note de contenu : - What is foam ? - sources of air induction - Micro-foaming and ink integrity - Steps to preventing micro-foaming : Step one : press side preparation - Step two : inke delivery to the press - Combating persistent foam Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12390 [article]

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